Product Analysis of the OH + NO2 + M Reaction

Article abstract of DOI:10.1021/j100292a032

A high-resolution Fourier transform spectrometer optically coupled to a fast flow multipass absorption cell was used to spectroscopically study the products of OH + NO2 + M -> HONO2 + M (1a) and OH + NO2+ M -> HOONO + M (1b).Infrared absorption spectra of the products of reaction 1 were recorded over the range 1850-3850/cm for the following conditions: pressure 3 to 850 Torr, temperature 248 to 298 K, and ₀ = (5 to 100)E11 molecules/cm³.The infrared absorption spectrum of HOONO was not observed under these conditions.If the OH stretch band strength of HOONO is equel to that of HONO2 this indicates <5percent HOONO formation in reaction 1.Quantitative measurements of the conversion of OH to HONO2 show that 75_-10⁺²⁵percent of reaction 1 forms HONO2.These results are compared with predictions of the branching ratio of reaction 1 obtained from statistical theory.